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Lucene example source code file (TokenOffsetPayloadTokenFilter.java)

This example Lucene source code file (TokenOffsetPayloadTokenFilter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

io, ioexception, ioexception, offsetattribute, offsetattribute, override, payload, payload, payloadattribute, tokenfilter, tokenoffsetpayloadtokenfilter, tokenoffsetpayloadtokenfilter

The Lucene TokenOffsetPayloadTokenFilter.java source code

package org.apache.lucene.analysis.payloads;
/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


import java.io.IOException;

import org.apache.lucene.analysis.TokenFilter;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.PayloadAttribute;
import org.apache.lucene.index.Payload;


/**
 * Adds the {@link org.apache.lucene.analysis.Token#setStartOffset(int)}
 * and {@link org.apache.lucene.analysis.Token#setEndOffset(int)}
 * First 4 bytes are the start
 *
 **/
public class TokenOffsetPayloadTokenFilter extends TokenFilter {
  private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
  private final PayloadAttribute payAtt = addAttribute(PayloadAttribute.class);

  public TokenOffsetPayloadTokenFilter(TokenStream input) {
    super(input);
  }

  @Override
  public final boolean incrementToken() throws IOException {
    if (input.incrementToken()) {
      byte[] data = new byte[8];
      PayloadHelper.encodeInt(offsetAtt.startOffset(), data, 0);
      PayloadHelper.encodeInt(offsetAtt.endOffset(), data, 4);
      Payload payload = new Payload(data);
      payAtt.setPayload(payload);
      return true;
    } else {
    return false;
    }
  }
}

Other Lucene examples (source code examples)

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